User Manual Toshiba 43L3753DB Smart TV

Press the MENU button on the remote. From there select the System option, this will show a sub menu with Picture, Sound & Settings options. Choose the Settings option and select Timers from the options this gives. The timer can be set in half hour intervals

Yes.
On the back there are three HDMI ports, an internet port, a SCART port and an aerial socket.
On the side there are two USB ports. I ise one for an SSD drive. There's also a 'commom interface' slot couple of sockets that I think are for audio and a button that can be used to access all the functions if the remote is not working.

Yes,you can use the headphone output to feed to an amplifier.